I strongly agree with this. Photography is a skill, and the technical aspects (exposure, depth of field, and the like) are the least difficult aspects of doing it well. If you're in too much of a hurry to learn the basics, any success you may have will be accidental.
Photography is largely about light. Exposure figures into this, but understanding light is also important for understanding things like flash. Kangaroo mentions an external flash, which is vital if there isn't enough ambient light. Not so much because a camera's built-in flash is weak, but because an external flash will have a bounce head which lets you reflect the light off of appropriate surfaces. Direct flash produces terrible images because of the angle, but also because flash falls off dramatically with distance, so you want to direct the flash so the overall light path to your subjects is about the same. Otherwise subjects in the foreground are overexposed and subjects in the background are underexposed.
Any really serious wedding photographer will have as much money invested in lighting as his camera and lenses. For posed shots, they'll have multiple remote flashes and reflective umbrellas to act as diffusers.
Honestly, wedding are not where I'd start. Too many variables interfere with learning. It's better to get the basics down with stationary subjects under well controlled conditions, so you can experiment and understand how each decision you make affects the photograph. At last in this day of digital photography, you can get immediate feedback about what you're doing, no need to wait for film development.